Hi @JamesB11 ,Did u already check your discovery mode settings? (can either be "strict" or "permissive")System->Controllers-> APIC1 --> Cluster as Seen By Node regards

I think you´re misunderstanding the function/need of L3 Outs.  L3 Outs are dedicated routed interfaces which are (or can be) used to connect routed aci networks & external routers, firewalls,etc.You only need L3 Outs if you plan to migrate SVIs/DGWs ...

Why would you add an L3 Out  to a bridge domain where unicast routing is disabled? greetz

Hi @michaelmccabe ,you can use any type of fiber as long as you use the corresponding sfps Cisco actually recommends using nexus 9200 or 9300 switches as IPN devices. regards

Hi @JlassiAhmed0345 ,can you share more details?For example:interface policy group from the border leaf InterfaceInterface & PC config from the connecting switchregards